Carburetor



Feb-24, 1931,

c. RUPOL I GARBURETOR Filed Dec. 26, 1928 3 9 m z a a J 4 y UQI'ZEQBOZZL ATTQR NEY Patented Feb. 24, 1931 UNHTED STATE CARL RUPOLI, GE CHICAGO, ILLINOIS CARBURETOR Application filed December 26, 1928. Serial No. 328,592.

This invention relates to improvements carburetors for internal combustion engines, an object being to provide means for automatically regulating the fuel feed of an 6 engine in accordance with its speed of operation.

For this purpose, the invention provides a carburetor of novel construction which includes a minimum speed nozzle through which liquid fuel is fed from the fuel reservoir of the carburetor to the engine for low speeds, and auxiliary fuel nozzles arranged with respect to the level of fuel within the reservoir, to feed additional fuel proportionate with the increase of engine speed.

lVith the above and other objects in view, the invention further includes the following novel features and details of construction, to be hereinafter more fully described, illustrated in the accompanying drawing and pointed out in the appended claim.

In the drawing Figure 1 is a sectional view showing a car-' buretor constructed in accordance with the invention.

Fig. 2 is an enlarged vertical sectional View of the auxiliary feed nozzles.

Figure 3 is an enlarged bottom plan view of the auxiliary feed nozzles.

Referring to the drawing in detail wherein like characters of reference denote corresponding parts, the carburetor as shown com prises a casing which includes a fuel reservoir or float chamber 10 and a Venturi tube. in a mixing chamber 11, a throttle or butterfly valve 12 being located within the latter and operated in any usual manner to control the passage of fuel mixture through the engine cylinders.

The reservoir or float chamber 10 is pro vided with an intake passage 13 through which the gasoline or other liquid fuel passes into the reservoir from t 1e supply tank. This passage includes a. chamber l l within which is located a screen 15. The inner end of this chamber is formed with a valve seat 16 which is adapted to receive a valve 17 whose stem passes through a float 18. The upper end of the stem of the valve 17 operates through a guide sleeve 19, while secured upon this stem is a collar 20 which is provided with an annular groove 21. Pivotally secured within the reservoir of float chamber 10 as shown at 22 are arms 237wh0se inner ends engage within the annular groove 21 and whose outer ends carry weights 24. I

lVhen fuel within the reservoir float chamber 10 reaches a predetermined level, the float 18 will rise to force the valve 17 downward upon its seat 16 and shut off the supply of fuel to the reservoir. As fuel leaves the reservoir and the float descends, the valve 17 will be liftedfrom its seat by the action of the-weights 24.

In addition to the reservoir or float chamber 10 and the mixing chamber 11, the carburetor includes a passage 25 while located within the lower end of this passage and extending upward therein is fuel feed nozzle 26. The lower end of this feed nozzle communicates with a passage 27 which in turn communicates with the, reservoir or float chamber 10, while extending downward from the passage 1'? and threadedly engaging the carburetor casing is a cleanout thimble 28. This thimble may also be removed to obtain access to the nozzle 26. The discharge end of the nozzle 26 is on the same horizontal plane with the normal level of fuel within the reservoir of float chamber, which level is indicated by the dotted line a.

Threadedly adjustable within the upper end of the passage 25 is a regulating screw 29. This screw is provided with a bore 30 whose lower end opens adjacent the discharge end of the nozzle 26 and whose upper end communicates with the passage 25 through openings 31. A port 32 provides communication between the passage 25 and the mixing chamber 11. A port 33 provides for the inlet of air into the passage 25.

The nozzle 26 is the minimum speed or idling nozzle and may be controlled by adjusting the regulating screw 29 so as to regulate the mixture of gasoline and air passing through the passage 30 into the mixing chamber 11. p

Extending upwardly within the mixing chamber are auxiliary fuel feed nozzles 33, 34 and 35. The upper or discharge ends of these nozzles are arranged at different elevations with respect to the normal fuel level a, so that as the speed of the engine increases, the nozzles 33, 34 and 35 will be successively brought into operation so as to automatically increase the fuel supply in accordance with the needs of the engine.

The auxiliary nozzles 33, 34 and 35 are of unitary construction and are threadedly secured in position and ti e glean-out thimble 36 is removably positioned adjacent the inner ends of these nozzles so that access may be had thereto. The air inlet for the carburetor is indicated at 37.

Located within the mixing chamber is venturi 38 held in adjustment position by means of a set screw 40. A set screw 41 is provided for the regulating screw 29.

The invention is susceptible of various changes in its form, proportions and minor details of construction and the right is herein reserved to make such changes as properly fall within the scope of the appended claim.

Having described the invention what is claimed is:

In a carburetor, a liquid fuel reservoir, a mixing chamber formed with a longitudinally disposed fuel passage communicating at its lower end with said reservoir, and having a port adjacent its upper end establish ing communication between the passage and said chamber, a fuel feed nozzle located in the passage at the lower end thereof and terminating in a'plane with the fuel level of said reservoir, a regulating screw threadedly adjustable in the upper end of said passage for movement toward and away from said nozzle, said screw'being hollow for a portion of its length, and including areduced intermediate portion formed with a plurality of apertures to establish communication between the screw and said mixing chamber through said port, and a plurality of auxiliary nozzles communicating with the fuel reservoir and having their discharge ends disposed at different elevations within said mixing chamber. In testimony whereof I ail-ix my signature.

CARL 'RUPOLI, 

